All, Just thought I'd toss this out. W2K3 SP1 supports interhost communications between NLB cluster nodes when using Unicast mode on servers with only one network interface through the use of a Registry key. URL to KB article is below: http://support.microsoft.com/kb/898867/ I find it interesting that Microsoft acknowledged this was a "problem". :-) Cordially yours, Jerry G. Young II MCSE (4.0/W2K) Atlanta EES Implementation Team Lead HHS Engineering Unisys 11493 Sunset Hills Rd. Reston, VA 20190 Office: 703-579-2727 Cell: 703-625-1468 THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.